The c/s-ethylene bond environment in (r/5-cyclopentadienyl).{ 1-[2-(2-nitrophenyl)vinyl]-r/5-cyclopentadienyl}_ tron IS not exactly planar; the corresponding torsion angle around the C--~C bond is 8.7 (7) °. The mean planes of the aromatic ring and the ethylene bond form a dihedral angle of 58.9 (1)°; the NO2-group plane is rotated by 32.8 (2) ° out of the benzene ring. A rather short contact between the olefin CH group and an NO2 oxygen atom [H...O 2.72 (4) ,~] may determine the differences in the reactivity of c/s and trans isomers. Comment The cis/trans isomers of 1-ferrocenyl-2-(2-nitrophenyl)ethylene are rather stable and do not interconvert spon-Acta Crystallographica Section C Abstract The molecule of the title compound, bis(2-amino-4-hydroxypent_anoato-N,O,O')copper(II), possesses crystallographic 1 symmetry. The Cu coordination geometry is distorted square bipyramidal. By virtue of the centre of symmetry, the metal atom and four of the six ligand donor atoms are in an equatorial plane and are rigorously coplanar. The structure consists of discrete molecules linked via O--H...O hydrogen bonds and van der Waals attractive forces.
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